861231711 has 8 divisors (see below), whose sum is σ = 1198235520. Its totient is φ = 549191192.

The previous prime is 861231703. The next prime is 861231799. The reversal of 861231711 is 117132168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861231711 - 2³ = 861231703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861231011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6240741 + ... + 6240878.

It is an arithmetic number, because the mean of its divisors is an integer number (149779440).

Almost surely, 2^861231711 is an apocalyptic number.

861231711 is a deficient number, since it is larger than the sum of its proper divisors (337003809).

861231711 is a wasteful number, since it uses less digits than its factorization.

861231711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12481645.

The product of its digits is 2016, while the sum is 30.

The square root of 861231711 is about 29346.7495815124. The cubic root of 861231711 is about 951.4223241203.

Adding to 861231711 its reverse (117132168), we get a palindrome (978363879).

The spelling of 861231711 in words is "eight hundred sixty-one million, two hundred thirty-one thousand, seven hundred eleven".